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authorLv Zheng <lv.zheng@intel.com>2015-10-19 10:25:50 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-10-22 02:05:05 +0200
commitf988f24ee7931d3487b36cc0c29164296bf2191e (patch)
tree9b4ed3372e6f85a5620e958ef3d05df9ca37c190 /drivers/acpi/acpica
parent086ab742ac97b45ee64507b32b3d1ecbdbc56b39 (diff)
downloadlinux-linaro-stable-f988f24ee7931d3487b36cc0c29164296bf2191e.tar.gz
ACPICA: Debugger: Add thread ID support so that single step mode can only apply to the debugger thread
When the debugger is running in the kernel mode, acpi_db_single_step() may also be invoked by the kernel runtime code path but the single stepping command prompt may be erronously logged as the kernel logs and runtime code path cannot proceed. This patch fixes this issue by adding acpi_gbl_db_thread_id for the debugger thread and preventing acpi_db_single_step() to be invoked from other threads. It is not suitable to add acpi_thread_id parameter for acpi_os_execute() as the function may be implemented as work queue on some hosts. So it is better to let the hosts invoke acpi_set_debugger_thread_id(). Currently acpiexec is not configured as DEBUGGER_MULTI_THREADED, but we can do this. When we do this, it is better to invoke acpi_set_debugger_thread_id() in acpi_os_execute() when the execution type is OSL_DEBUGGER_MAIN_THREAD. The support should look like: create_thread(&tid); if (type == OSL_DEBUGGER_MAIN_THREAD) acpi_set_debugger_thread_id(tid); resume_thread(tid); Similarly, semop() may be used for pthread implementation. But this patch simply skips debugger thread ID check for application instead of introducing such complications as there is no need to skip acpi_db_single_step() for an application debugger - acpiexec. Note that the debugger thread ID can also be used by acpi_os_printf() to filter out debugger output. Lv Zheng. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
-rw-r--r--drivers/acpi/acpica/acglobal.h1
-rw-r--r--drivers/acpi/acpica/aclocal.h8
-rw-r--r--drivers/acpi/acpica/dbexec.c3
-rw-r--r--drivers/acpi/acpica/dbxface.c28
4 files changed, 38 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index e57686533f6d..faa97604d878 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -327,6 +327,7 @@ ACPI_GLOBAL(struct acpi_external_file *, acpi_gbl_external_file_list);
ACPI_INIT_GLOBAL(u8, acpi_gbl_abort_method, FALSE);
ACPI_INIT_GLOBAL(u8, acpi_gbl_method_executing, FALSE);
+ACPI_INIT_GLOBAL(acpi_thread_id, acpi_gbl_db_thread_id, ACPI_INVALID_THREAD_ID);
ACPI_GLOBAL(u8, acpi_gbl_db_opt_no_ini_methods);
ACPI_GLOBAL(u8, acpi_gbl_db_opt_no_region_support);
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 4e41b43ebad3..e1dd784d8515 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -109,6 +109,14 @@ struct acpi_rw_lock {
#define ACPI_MUTEX_NOT_ACQUIRED (acpi_thread_id) 0
+/* This Thread ID means an invalid thread ID */
+
+#ifdef ACPI_OS_INVALID_THREAD_ID
+#define ACPI_INVALID_THREAD_ID ACPI_OS_INVALID_THREAD_ID
+#else
+#define ACPI_INVALID_THREAD_ID ((acpi_thread_id) 0xFFFFFFFF)
+#endif
+
/* Table for the global mutexes */
struct acpi_mutex_info {
diff --git a/drivers/acpi/acpica/dbexec.c b/drivers/acpi/acpica/dbexec.c
index 8eef298963a2..258e6157c658 100644
--- a/drivers/acpi/acpica/dbexec.c
+++ b/drivers/acpi/acpica/dbexec.c
@@ -725,7 +725,8 @@ acpi_db_create_execution_threads(char *num_threads_arg,
for (i = 0; i < (num_threads); i++) {
status =
- acpi_os_execute(OSL_DEBUGGER_THREAD, acpi_db_method_thread,
+ acpi_os_execute(OSL_DEBUGGER_EXEC_THREAD,
+ acpi_db_method_thread,
&acpi_gbl_db_method_info);
if (ACPI_FAILURE(status)) {
break;
diff --git a/drivers/acpi/acpica/dbxface.c b/drivers/acpi/acpica/dbxface.c
index bef5f4ed22a0..342298a6e10f 100644
--- a/drivers/acpi/acpica/dbxface.c
+++ b/drivers/acpi/acpica/dbxface.c
@@ -164,6 +164,12 @@ acpi_db_single_step(struct acpi_walk_state * walk_state,
ACPI_FUNCTION_ENTRY();
+#ifndef ACPI_APPLICATION
+ if (acpi_gbl_db_thread_id != acpi_os_get_thread_id()) {
+ return (AE_OK);
+ }
+#endif
+
/* Check the abort flag */
if (acpi_gbl_abort_method) {
@@ -431,7 +437,7 @@ acpi_status acpi_initialize_debugger(void)
/* Create the debug execution thread to execute commands */
acpi_gbl_db_threads_terminated = FALSE;
- status = acpi_os_execute(OSL_DEBUGGER_THREAD,
+ status = acpi_os_execute(OSL_DEBUGGER_MAIN_THREAD,
acpi_db_execute_thread, NULL);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
@@ -439,6 +445,8 @@ acpi_status acpi_initialize_debugger(void)
acpi_gbl_db_threads_terminated = TRUE;
return_ACPI_STATUS(status);
}
+ } else {
+ acpi_gbl_db_thread_id = acpi_os_get_thread_id();
}
return_ACPI_STATUS(AE_OK);
@@ -485,3 +493,21 @@ void acpi_terminate_debugger(void)
}
ACPI_EXPORT_SYMBOL(acpi_terminate_debugger)
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_set_debugger_thread_id
+ *
+ * PARAMETERS: thread_id - Debugger thread ID
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Set debugger thread ID
+ *
+ ******************************************************************************/
+void acpi_set_debugger_thread_id(acpi_thread_id thread_id)
+{
+ acpi_gbl_db_thread_id = thread_id;
+}
+
+ACPI_EXPORT_SYMBOL(acpi_set_debugger_thread_id)